MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumSalt Hydrolysis

The Ksp of CuS, Ag₂S and HgS are 10–31, 10–44 and 10–54 respectively. The solubility of these sulphides are in the order

A.Ag₂S > CuS > HgS✓ Correct

B.Ag₂S > HgS > CuS

C.HgS > Ag₂S > CuS

D.CuS > Ag₂S > HgS.

Explanation

Let the solubility of each given salt be S. + 2 2 2 3 sp 1/3 1/3 44 sp 2 2 2 sp Ag S s aq. S aq. K 2s 4s s K / 4 10 / 4 HgS s Hg aq. S aq. K g = 2A s s 54 27 1 sp 2 2 2 sp 31 15 1 sp s K 10 10 molL CuS s aq. S aq. K s s K 10 3.16 10 molL Cu x Therefore, the order is- 2 HgS CuS Ag S

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